Investigating the effect of zinc supplementation on probability of relapse and mental health in patients with opioid use disorder undergoing methadone maintenance treatment

Table 2 A comparison of RPS scores in study groups

Variables	Groups	Before intervention Mean ± SD	One month after intervention Mean ± SD	Three months after intervention Mean ± SD	P¹	P³	Partial eta square^a
Variables	Groups	Before intervention Mean ± SD	One month after intervention Mean ± SD	Three months after intervention Mean ± SD	P²	P³	Partial eta square^a
likelihood of drug use	Control	73.11 ± 18.54	73.79 ± 17.26	77.97 ± 18.12	0.49	0.01	0.09
likelihood of drug use	Intervention	65.88 ± 21.26	64.94 ± 17.73	70.02 ± 23.47	0.35	0.01	0.09
Drug craving	Control	75.61 ± 14.04	79.76 ± 12.48	76.94 ± 13.30	0.43	0.002	0.136
Drug craving	Intervention	73.26 ± 15.18	69.323 ± 12.965	70.000 ± 14.034	0.38	0.002	0.136
Total score	Control	148.73 ± 3.66	153.55 ± 20.81	154.91 ± 23.61	0.49	0.002	0.142
Total score	Intervention	139.14 ± 29.99	134.26 ± 24.27	140.02 ± 27.98	0.41	0.002	0.142

P¹ = Significant for the trend mean values in the control group (Repeated measures ANOVA)
P² = Significant for the trend mean values in the intervention group (Repeated measures ANOVA)
P³ = Significant for the total difference in means (before and after the intervention) between the intervention and control groups (Repeated measures ANOVA)
^aPartial Eta Square interpret: 0.01 ∼ small, 0.06 ∼ medium, > 0.14 ∼ large

ISSN: 1747-597X